I wish that I still had my resort map. Being that you have older kids I would request a room by the Pirate Plunge pool. Buidlings 28 and 29 are closest, followed by 10, 13,12,14. Building 15 is the closest to I-4 and it connects with building 14. Buildings 13, 12, and 14 are the closest buildings to Horizons Harbor which is the pool with the pirate ship and the Grille. We stayed in building 12 on the first floor and we were equi-distant to both pools. The resort is small so it's not like you are going to be walking forever to get to either of the pools.
As far as the pools being heated, I am not sure. When we were there a few weeks ago they were warm at night. The temperatures were just right.
As far as the Grille at the pool, they serve basic easy foods....salads, fries, onion rings, wings, steak subs, chicken salad, hamburgers, fish sandwiches, wraps. I think that the heaviest thing on the menu was the hamburger. You can eat breakfast, lunch, and dinner there. It is all outside seating. You order at the bar and they either call you up to get your food or if the bartender isn't busy.
We did 1 day at AK, 1 night at
MNSSHP, and 1 day at Sea World. This was not really a Disney vacation for us so it was no big deal for us not to be on site this time. We were very relaxed. Check out the review section of this board and you will see 2 good reviews/compare & contrast to Grande Vista written by myself and another DIS'er. I also have a link to my pictures at the end of my review if you haven't already seen them.
Here's a link to the
Resort Map click on it to get a bigger picture